A blog can easily be structured by categories or something and still stay a "blog". One big question is, what happens with information, when it gets out of dat

A blog can easily be structured by categories or something and still stay a "blog". One big question is, what happens with information, when it gets out of date? For example, you write a blog post "Scala is the greatest language ever" and a few years later you decide "Lisp is the greatest language ever". In blog-form you write another entry. In contrast, a wiki-form would mean to change a page, such the the old Scala entry is only reachable some revision system, if at all.